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Journal de Th´

eorie des Nombres

de Bordeaux

17

(2005), 921–924

On sum-sets and product-sets of complex numbers

par

ozsef SOLYMOSI

R´esum´e. On donne une preuve simple que pour tout ensemble fini de nombres complexes A, la taille de l’ensemble de sommes A+Aou celle de l’ensemble de produitsA·Aest toujours grande.

Abstract. We give a simple argument that for any finite set of complex numbers A, the size of the the sum-set, A+A, or the product-set,A·A, is always large.

J´ozsefSolymosi

Department of Mathematics, University of British Columbia 1984 Mathematics Road, Vancouver, Colombie-Britannique, Canada V6T 1Z2

E-mail:[email protected]

Manuscrit re¸cu le 26 aout 2003.

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